Group 1 - The core point of the article is that Chongda Technology (002815.SZ) has confirmed that its subsidiary, Punowei, produces IC substrates that are indirectly used in Apple's TWS (True Wireless Stereo) headphones and other consumer electronics [1] Group 2 - The company has stated that specific customer and cooperation details cannot be disclosed due to confidentiality agreements [1]

Group 1 - The company, Chongda Technology, confirmed that its subsidiary, Puno Wei, provides IC substrate products that are indirectly used in Apple's TWS (True Wireless Stereo) headphones and other consumer electronics [2] - Due to confidentiality agreements, the company is unable to disclose specific customer details or cooperation specifics [2]